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Effect of Carotenoids on the Growth of HT-29 Human Colon Cancer Cells

Carotenoids가 인체의 대장암 세포인 HT-29 세포의 증식에 미치는 영향

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  • Frederick Khachik (Joint Institute for Food Safety & Applied Nutrition, University of Maryland) ;
  • 김은지 (한림대학교 실버생물산업기술연구센터) ;
  • 정재인 (한림대학교 생명과학부) ;
  • 이현숙 (한림대학교 생명과학부) ;
  • 강일준 (한림대학교 생명과학부) ;
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  • 윤정한 (한림대학교 생명과학부)
  • Published : 2003.04.01

Abstract

Epidemiological studies have observed a negative association between increased consumption of green and yellow vegetables and cancer incidence. These vegetables contain carotenoids, which are reported to exhibit anticarcinogenic effects. Overexpression of ErbB2 and ErbB3 genes is a frequent event in several human cancers. The present study was performed to determine whether $\alpha$-carotene, $\beta$-carotene, lutein, or lycopene inhibits cell growth and to assess such an effect is related to changes in the levels of the ErbB receptor family and tile ErbB3 receptor signaling pathway in HT-29 cells. HT-29 cells were cultured in serum-free medium in the presence of various concentrations (0~100 $\mu$M) of the individual carotenoids. $\alpha$ -Carotene and lycopene significantly inhibited cell growth in a dose-dependent manner, whereas lutein slightly inhibited cell growth and $\beta$-carotene increased cell growth. Lycopene is more potent than $\alpha$ -carotene in inhibiting HT-29 cell growth. Lycopene inhibited DNA synthesis and induced apoptosis of HT-29 cells. The ErbB3 ligand heregulin (HRG) increased cell growth but did not prevent the lycopene-induced inhibition of cell growth. Lycopene decreased ErbB2 protein levels in a dose-dependent manner. Immunoprecipitation/Western blot studies revealed that lycopene inhibited HRG-induced phosphorylation of ErbB3, recruitment of the 985 regulatory subunit of phosphatidylinositol 3-kinase (PI3K) to the ErbB3 receptor, and phosphorylation of Akt. These results indicate that downregulation of ErbB2/ErbB3/PI3K/Akt signaling may be one of the mechanisms by which lycopene inhibits HT-29 cell pro-liferation and induces apoptosis.

Carotenoids는 항암 효과가 있는 것으로 알려져 있으나 각각의 carotenoids가 대장암에 미치는 영향에 대해서는 명확하게 밝혀진 바가 없다. 본 연구에서는 4가지 종류의 carotenoids가 인간의 대장에서 유래한 암세포인 HT-29 세포의 증식에 미치는 영향을 조사하였다. $\alpha$-carotene, $\beta$-carotene, lutein lycopene을 농도를 달리 하여 세포 배양액 에 첨가하여 살아있는 세포의 수를 측정한 결과 $\beta$-carotene는 세포의 증식을 다소 증가시키는 반면 $\alpha$-carotene, lutein, lcopene은 세포의 증식을 감소하였다. 세포의 증식을 억제한 carotenoids 중에서 lycopene이 그 효과가 가장 컸다. ErbB receptor family는 세포의 증식을 촉진하고 대장암에서 그 발현이 증가된 것으로 보고되었기 때문에 lycopene이 heregulin-ErbB3 signaling을 억제하는지를 조사하였다. Lycopene는 ErbB2 단백질을 감소하였고 ErbB3 단백질의 변화를 초래하였다. Heregulin을 첨가하여 인산화를 유도한 경우 ErbB3의 인산화, ErbB3와 p85의 결합, Akt 인산화가 lycopene에 의해 억제되었다. 이 결과들은 carotenoids 중 lycopene이 대장암 세포 증식 억제 효과가 가장 크고, 대장암 세포의 DNA 합성을 억제하고 apoptosis를 유도하는 lycopene효과의 일부는 Erb-B3와 Akt의 인산화 감소에 기인하는 것임을 나타낸다.

Keywords

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